There's no one-size-fits-all answer, but frequencies in the delta range (0.5–4 Hz) are often associated with deep sleep.
- Delta waves are the slowest brain waves and are most prevalent during deep sleep, which is crucial for physical and mental restoration.
- Binaural beats, which create the perception of a third tone by playing two different frequencies in each ear, have shown some promise in promoting sleep. Research suggests that binaural beats at a delta frequency (3 Hz) may be helpful for sleep.
- Solfeggio frequencies, such as 432 Hz and 528 Hz, are believed by some to have healing and restorative properties. However, scientific evidence supporting their specific effects on sleep is limited.
It's important to note that individual responses to different frequencies can vary and there's no guarantee that any particular frequency will work for everyone.
Experiment with different frequencies and approaches to find what helps you achieve restful sleep.